Rock-drill.



A. L. ENGELS & J. WALKER.

ROCK DRILL.

APPLICATION FILED IULY 21,1914.

1 1 gmfigy I Patented July 11, 1916.

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I /m em W M W @1 m mm ANDREW 3L. ENGELS AND JOSEPH WALKER, 01E BlISIBlEE, ARIZONA.

BUCK-DRILL.

Specification of Letters Patent.

Patented July 11, 191%.

Application filed July 21, 19141. Serial No. 852,300.

To all whom 2'23 may concern:

Be it known that we, ANDREW L. Enema and JOSEPH WALKER, both citizens of the United States, and residents of Bisbee, county of Cochise, and State of Arizona, (the post-ofice address of each being Bisbee, Arizona,) have invented an Improvement in Rock-Drills, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to rock drills and is more especially concerned with means for guiding the drill bit and permitting holes to be started at an angle.

Our invention will be best understood by I reference to the following specification when taken in connection with the accompanying drawings of one illustrative embodiment thereof, while its scope will be more articularly pointed out in the appended c aims.

In the drawin s': Figure 1 is a side elevation of a rock rill embodying our invention; Fig. 2 is a detailed sectional view of the same on an enlarged scale on lines 22 of Fig. 1; and Fig. 3 is a detailed View of a modified form of fastening means for the separable guide.

Referring to the drawings and to the embodiment of our invention which we have selected for illustration, we have there shown a rock drill comprising a drill bit 4 which may be operated by any appropriate means, herein a common form of pressure fluid engine having a piston 5 working in a cylinder 6, the latter being mounted in the guide-" ways 7 in a shell 8, upon which it may be fed longitudinally by any usual or desired means, as, for example, a feed screw 9 having a crank 10, and operating in a familiar manner which it will be unnecessary here to describe, as it forms no essential part of our present invention. The shell 8 is herein shown as reversible whereby the rock drill may be employed to drill holes in any position of the machine, whether in an upward or a downward direction or in a generally horizontal direction at the will of the operator.

In operating rock drills of this type there is often a lateral stress on the drill bit, particularl in starting holes at an angle. Under suc circumstances, it is desirable to proare parallel to the axis of the drill bit.

vide a guide which shall guide the outer end of the drill bit adjacent the work, apart from the guidance afforded by the drill chuck or cylinder head. To this end, we have herein provided a drill bit guide designated generally by the numeral 11, preferably mounted in fixed position with respect to the length of the drill bit, and the lengthwise motion of the cylinder as the latter is fed toward or withdrawn from the work.

This drill bit guide is preferably separable,that is to say,-it is capable of being opened to permit the drill bitto be removed laterally therefrom. It is, of course, well known that drill bits are provided with enlargements at the front end and sometimes at the rear end as well, the front end enlargements being for the purpose of providing the necessary cutting edges with their clearances, whereas the rear end enlargement is often in the form of a shank held in a drill chuck in some appropriate mariner. In order to permit a drill bit of the described character to be removed from the guide, the latter is herein composed of a pair of members 12 and 13, forming together i an aperture 14 in which the drill bit has a V sliding fit. These members may be movably mounted in any appropriate manner whereby they may be separated to permit the removal of the drill bit, but in the present embodiment of our invention are mounted respectively on pivots 15 and 16, whose axes These pivots are herein in the form of shouldered studs appropriately S901. ed to the shell 8 and provided at their outer ends with nuts 17 and 18, by means of which a plate 19 is secured in spaced relation to a similar plate 20 at the outer end of the shell, whereby the members 12 and 13 are permitted to turn freely on their pivots while held against axial movement thereon. It will here be observed that the plates 19 and 20 are both notched to provide continuations of the grooves 7 in the shell 8.

The members 12 and 13 may be held in drill bit guiding relation by any appropriate means such, for example, as a swinging'bolt 21.pivoted at 22 to the member 12 and engaging the member 13 in any suitable manner. Herein both members are bifurcated. The bolt is hinged or pivoted in the bifurcamay be fixedly secured in drill shown in dotted lines tion of one member and engages in the bifurcation of the other member, and in the form shown in Figs. 1 and 2 is provided with a nut 23 bymeans of'which the two members bit guiding relation, but may be instantly disconnected and swung laterally from the position shown in full lines in Fig. 2 to the position ter position the two members may be secured to each other by the bolt and thus locked underneath the shell out of the way during the changing of the drill bit.

If desired, the nut may be dispensed with, and-there may be substituted for the bolt an L-shaped member 24 provided with a head 25 having an inclined or wedge-like surface or surfaces 26, whereby the two members of the guide may be drawn toward eachother by simply swinging the L-shaped member into place, and giving it a light tap with a hammer, thus locking the parts in drill bit holding relation.

It w1ll now be apparent that when the rock drill'is in operation and a hole 1s being started, the described supplemental guide will effectively guide the forward end of the drill bit and prevent the latter from becoming displaced laterally, yet the drill bit may be quickly and conveniently removed and replaced by another. that the unlocking and opening of the drill bit guide may be accomplished without the necessity of stoppin the machine and immediately locked un erneath out of the way during the changing of the drill steels.

While we have herein shown and described one specific embodiment of our invention for illustrative purposes, and have disclosed and discussed in detail the construction and arrangement incidental to one invention may from the principles thereof.

specific application thereof, it is to be under-.

stood that the invention is limited neither to the mere details nor relative arrangement of parts, nor to its specific embodiment herein shown, but that extensive deviations from the illustrated form or embodiment of the be made, without departing Having thus described our invention, what we claim and desire by Letters Patent to procure is 1. A rock drill comprising, in combination, a drill bit, means for reciprocating said drill bit, a mounting upon which said means is mounted to slide lengthwise of the drill bit, and separable drlll bit guiding means comprising a purality of members pivoted to the mounting inaplane transverseto said drill bit in such manner that they may severally be swung clear of said drill bit and into proximity in reversed position and means to clamp similar manner either in drill bit guiding relation or insaid reversed position.

therein. In the lat- It will also be evident said members together in 2. A rock drill, comprising, in-combination, a drill bit, means for reciprocating said drill bit, a mounting upon which said means is mounted to slide lengthwise of the drill bit, and separable drill bit guiding means comprising a plurality of members pivoted to the mounting in a plane transverse to said drill bit in such manner that they may severally be swung clear of said drill bit into prox1mity in reversed position and means to clamp said members together in similar manner either in drill bit guiding relation or in said reversed position, the members in such first mentioned relation together fromiong an opening to receive and guide the drill 3. A rock drill comprising, in combination, a drill bit, means for reciprocating said drill bit, a mounting provided with longitudinal grooves in which said means may relation.

4. A rock drill comprising, in combination, a drill bit, means for reciprocating said drill bit, a mounting on which said means may slide lengthwise of the drill bit, and separable drill bit guiding members pivoted on the end face of said mounting to swin in a plane transverse to the bit, said mem ers cotiperatively forming an opening to receive and guide the drill bit and means for clamping said members together in drill bit guiding relation.

5. A rock drill comprising, in combination, a drill bit, means for reciprocating said drill bit, a mounting provided with longitudinal grooves in which said means may slide, ivots projecting from the end face of sai mounting, drill bit guiding members on said ivots to swing in a plane transverse to the drill bit and coiiperatively forming an opening to receive and guide the same, a late having a surface conforming to and a ining with the guiding surface of said mounting, maintained outwardly of said members and means to secure said members in drill bit guiding relation said members adapted to be swung clear of said guiding surface when not so secured.

6. A rock drill comprising, in combination, a drill bit, means for reciprocatin said drill bit, a mountin provided witi longitudinal grooves in Wll0ll said means may slide, pivots projecting from the end face of said mounting, drill bit guiding members on said pivots to swing in a plane transverse to the drill bit coiiperatively forming an opening to receive and guide the same, a plate having a surface conforming K, mm

names to this specification, in the presence of two subscribing witnesses. v

ANDREW n ENGELS. JOSEPH WALKER.

Witnesses:

S. H. Donn, S. A. GOFF. 

